Improvement in stop-valves



UNITED STATES PATENT OFFICE.

WM. SHEDLOOK, ALFRED SHEDLOOK, AND GEORGE MARSHALL,

BROOKLYN, E. D., NEW YORK.

IMPROVEMENT IN STOP-VALVES.

Specilication forming part of Letters Patent No. 52,895, dated February 27, 1866.

had to the accompanying drawings, forming apart of this specification, in which- Figure l represents a central vertical lon gitudinal section of a stop-valve constructed ac-A cording to our invention. Fig. 2 is a horizontal section ofthe same with the valve partly opened. Fig. 3 is a transverse vertical section of the same through line Figs. 1 and 2, looking toward the back of the valve.

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in a novel construction and arrangement of stop-valves for steam, water, or other pipeswherein the valve attached to a carriage is made to slide to or from its seat, in a direction perpendicular thereto, upon bearings provided upon the inner surface of the surrounding shell or casing, by means of a cam of appropriate shape, which is worked by a rod extending through a stuffing-box.

To enable others skilled in the art to construct and apply our invention to use, we will proceed to describe it with reference to the drawings.

A A' is the hollow shell containing the valve and its necessary appurtenances, provided with female screw-threads upon the inner surface of each end, for the purpose of adapting it to acorresponding male thread, which may be upon the ends of the pipes to which the valve is to be applied. This shell is made in two parts, the end Al being screwed into the body ofthe shell at a, and nished upon its inner face for a valve-seat, b, either plane or concave.

Upon the inner surface of the shell A are two bearings, O O, running longitudinally and parallel with linear center of the same, and directly opposite each other. A carriage, B, attached to the valve D slides upon these bearings O, O, and has upon its upper surface a short pin or stud, which rests against the inner face of a scroll-cam, E, used for the purpose of opening and closing the valve, the outer face ofthe cam bearing against the rea-r surface or back ofthe valve. This cani has a socket ot' a square or polygonal shape, into which a spindle, G, with corresponding end iits, said spindle being arranged parallel with the valve-face and passing through a studingbox, H, on the shell A, and being provided with a collar, h, to keep it in place.

The cam rotates when the spindle G is turned, and opens or closes the valve by the decreasing oriucreasing radial distance of the cam-faces bearing against pin F, or back of the valve l) from the center of revolution of spindle G and cam E.

The valve is constructed with a Hat metal face, and the seat isfaced with a rin g ot' indiarubber or other suitable soft material, b. The pressure of the steam or Water comes toward the rear ofthe valve, and hence tends to hold the rubber ring against the seat, whereas it' the india-rubber were applied to the valve the pressure would have atendency to tear it off.

What we claim as ourinvention, and desire to secure by Letters Patent, is-

The valve D, att-ached to a carriage, B, sliding` l in a direction perpendicular to the valve-seat on iixed bearings C (l, and operated by a spindle, G, and cam E, applied and operating substantially as herein set forth.

WILLIAM SHEDLOOK. ALFRED SHEDLOOK. GEORGE MARSHALL.

Witnesses:

Jos. E. PALMER, EDW. lnorsoiv. 

